Shutter casing



Sept. 4. 1928.

w. A. RIDDELL sHUMER QASING Filed July 21, 1925' WiZZz'anbARiddZL,

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. Application filed July 21, 1925. Serial No. 45,129.

This invention relates to photography,.and more articularly tophotographic shutters. One ject ofmy invention is to produce a shuttercasingwhi'ch maybe made of relatively Y thin light metal reinforced forstrength at necessary places; Another obe'ct is to provide an annularsh-utter casing aving a' rearwardly extending lens tube formed of adouble thicknessof metal. Another'object is to provide a shutter casingwitha lens tube, as above described', with an inwardly extending flangelying in substan tially the same plane as the base plate. of the shuttercasing, thus providingan additional area for supporting the shuttermechanism.

Another ob ect is to provide a shutter bladesupporting member which" isintegral with the shutter casingand extends inside of the lens tube, andother objects will appear from the following. specification, the novelfeatures being particularly pointedbut in the claims at the end theieof.

In the drawings wherein like reference characters denote lihe partsthroughout Fig. 1 is a plan view of a typical "shutter with the shuttercover removed having a casing constructed in accordance with, andillustrating one embodlment of my in-.

' vention; v Y gig. 2 isa section on, line 2-2 of Flg. 1; an i Fig; 3 isa side elevation of the assembled. shutter attached to a camera lensboard, the

fragmentary showing of the lens board and I have shown, by. way ofsimpl'le1 shutter of the type shown in my copen g applicationforphotographic shutters, Serial No.'-741,036, filed Oct. 1,1924. Whilethe subject-matter of the resent application is particularly adapted fthis simple; shutter, it 15 also equally-suitable for use with shuttersof difierent types, par

' 'meniscus achromatic lens 30, is carried in}! ticularly those inwhiohthe shutter casing 4 is made of relatively thin metal-and is pro 'videdwith: a tubular member for supporting the camera. objective.

In Fig. 1,1 have shown only the essential parts 7 p the shutter. Theshutter casing 1 comprises an annular base plate 1 provid with a flange2 extending from the periphery of bare plate, and a rearwardly extend-This lens tube is formed Iran the metal from which the base late is Imade, and consists of a double wall tubu'i ing 1618 tllb8 3.

shutter leaf 10 is carried by a'pivot 11 which illustration, a

or use-with '-be fastened to the camera lens boar '32 and 34 also suporting at 35 one end of I lar member havin a flange 4 extending from theinner edge 0 the tube in substantially the same plane as that of thebaseplate 1. Thus, the area of the base plate 1 is, in effect, increased bythe area of flange.4.. The outer tubular member 5 isprovided with athread 6 and theinner tubular member 7 is provided with interior-threads8: Thetubular members are formed ofthe same piece of metal, tube 5 beingbent upon itself at 9 so that a "wall of, tube 7 1 will lie against tube5," thus forming a ery rigid lens tube. It should be part cul lyl notedthat only one piece of metal is employed in making the shutter casingabove described. The .base late 1, flange 2 double wall lens-tube 3, anflange 4 are all structurally integral.

' The shutter mechanism 1s supported upon the base plate. In-,.thepresent instance, the-- passes through into base. late 1. Theshuttertleafl 10 lies against a (1 forms a substan- 'tially light-tightconnection with the flange 4 at 12.. The master member 13' is pivoted tothe shutter casing u on a stud 14, and there .is a' stud 15 pivota' yattaching the master member to the shutte n'blade. The master member isprovided with a camslot- 16, in which 'a stud 17 may travel, stud 17being carried by link18 whichis pivoted upon a stud 19 carried bythe-shutter casing. This stud also supports theexposure lever 20. One

end of the exposu're'lever carries a stud 21 which supports one end of ahairpin spring 22. The opposite end of this spring encircles stud 17.When the exposure lever y 20jis moved in one direction,the" 18, throughthe action of spring 22, gives a backand-forth movement'to the mastermember 13, causing theshutter leaf 10 to swing to and from thepositionshown in fulljhn'es in Fig.1. r 1.

The camera'objective, in this case a simple cell 31 which 'may bescrewed into the thread 8- of the lens tube. The shutter casin 1 mgymeans of a collar 33 which lies against the inside plate 34 of the lensboard, the plates .106 the bellows 36. llar 33 screws on the threadedportion 6 of the lens tube. I With the construction abovedescribedreltivel thin sheet metal may be used for the s uttlar'casing. The lenstube is reinno forced by being made of a double thickness of met-a1,thus permitting a relatively coarse thread to be used for both theshutter retaining collar 33 and the objective collar 31. In addition toproviding a reinforced lens tube, the double thickness of metal alsopermits the flange 4.- to beformed inwardly so as to, in effect, form anextension on the shutter base plate 2 so as to form a support for partsof the shutter mechanism.

The shutter casing comprising the base plate 1, flanges 2 and 4 anddouble walled lens tube 3 are all integral, being formed from a singlesheet of metal. When the term integral appears in. the following claimsI mean this term to include only a structurally integral shutter casingand not one built up from a number of parts.

Having thus described my invention, what I claim as new and desire tosecure by Letters Patent is:

1. In a photographic shutter, the combination with shutter mechanism, ofa shutter casing for enclosing the shutter mechanism comprising anintegral structure, said structure including an annular base plate, aflange extending around the periphery of the base plate and adouble-walled tubular extension from the base plate between the flangeand the aperture of the annular member, the walls of the double-walledtubular extension lying in contact whereby a reinforced tubularextension is provided.

2. In a photographic shutter, the combination with shutter mechanism, ofa casingcomprising an annular structure carrying the shutter mechanismand including an annular base plate, a tubular extension from thebaseplate including a pair of walls having contacting areas, a flange onthe tubular extension in approximately the plane of the base plate, saidflange forming a support for parts of the shutter mechanism.

3. In a photographic shutter, the combination with shutter mechanism, ofa casing comprising an integral structure for the mechanism andincluding an annular base plate, a tubular extension from the base plateincluding a pair of walls having contacting areas and a flange formedfrom the end of the tubular member and lying in a plane parallel to theplane of the base, said flange serving as a support for parts of theshutter mechanism.

4. In a photographic shutter, the combination with shutter mechanism,including a shutter leaf,-0f a casing comprising an in-' tegralstructure for the mechanism and including an annular base plate, atubular extension from the base plate including a pair of walls havingcontacting areas and a flange formed on the end of the tubular membersaidfiange lying in a plane parallel to the plane of the base, saidflange forming a slidevay supporting the shutter leaf when the shuttermechanism is in a, closed position.

5. A photographic shutter casing compris- 'ing a. one-piece integralstructure including an annular base plate, a flange extending in onedirection from the periphery of the annular plate, a double-walledtubular-member extending from the inner edge of the annular member, anda flange extending from an. end of one of the double-walled tubularmembers lying in a plane parallel to the plane of the annular baseplate.

6. A-photographic shutter casing comprising an integral structureincluding an annula r base plate having a double-walled tubularextension from the base plate between the inside and outside peripheriesof the annular base plate, the walls of the tubular member havingcontacting areas.

7. In a photographic shutter, the combination with shutter mechanism, ofan annular plate for supporting the shutter mechanism, and an integraltubular extension from the base plate including two walls havingcontacting areas, said tubular extension being of greater diameter thanthe opening of the annular member, whereby a reinforced objectiveholding tube is provided. 1

8.v In av photographic shatter, the combination with shutter mechanism,of a one-piece integral housing therefor, including an apert'ured baseplate, an extension from the base plate comprising two contacting wallsadapted to support the camera objective, said extension being larger incross section than the aperture of the base plate.

9. .A photographic shutter casing, comprising a relatively flat baseplate made from one pieceof metal in two sections, and a double-walled.integral extension formed by the t\ ropieee sections, and the other wallof the extension being carried by the other section of the base plate,the two base plate sections being joined together by the doublewalledextension.

Signed at Rochester, New York, this 11th day of July 1925.

WILLIAM A. BIDDELL.

